Place crab meat and cream cheese in a large bowl.,Mix on low speed until crab is shredded and cheese is well mixed with crab. Add Old Bay seasoning, cayenne pepper, half and half and Worcestershire sauce.,Mix for an additional minute.,Spread in shallow baking dish and top with Swiss cheese slices.,Bake at 400° until cheese is melted and bubbly around the edges, about 20 minutes.,______